Evolution of the rate-limiting step: From thin film to thick Ni-rich cathodes

Ni-rich NMC (LiNixMnyCo1-x-yO2, x ≥ 0.6) has the attributes of high specific capacity (greater than 180 mAh/g), high operating voltage (ca. 3.8 V) and low cost, which is therefore deemed as one of the most promising cathode candidates for next-generation high-energy Li-ion batteries (LIBs). However,...

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Bibliographic Details
Published in:Journal of power sources 2020-04, Vol.454 (C), p.227966, Article 227966
Main Authors: Hu, Jiangtao, Wu, Bingbin, Cao, Xia, Bi, Yujing, Chae, Sujong, Niu, Chaojiang, Xiao, Biwei, Tao, Jinhui, Zhang, Jiguang, Xiao, Jie
Format: Article
Language:English
Subjects:
Electronic conductivity
Ionic conductivity
Ni-rich cathode
Phase change
Rate-limiting step
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Summary:Ni-rich NMC (LiNixMnyCo1-x-yO2, x ≥ 0.6) has the attributes of high specific capacity (greater than 180 mAh/g), high operating voltage (ca. 3.8 V) and low cost, which is therefore deemed as one of the most promising cathode candidates for next-generation high-energy Li-ion batteries (LIBs). However, challenges exist before the large-scale commercialization of Ni-rich cathode such as gas generation, capacity degradation especially at high rates or elevated temperatures. From thin film to densely packed high loading cathode, this work investigates the rate-limiting steps in Ni-rich cathode e.g., phase structure, electronic and ionic conductivity to understand the reaction kinetics at different scales. This work provides new insights in understanding the electrochemical properties of Ni-rich cathode at different levels to inspire revolutionary ideas to address the fundamental issues of Ni-rich cathode from material to relevant electrode levels. •Understanding rate-limiting steps of NMC from lattice level to thick electrode.•Li+ diffusion kinetics in different phases has been studied within thin electrode.•Rate-determining factor of thick cathode was researched by modifying porosity.•Ionic/electronic conductivities in thick electrode were affected by the porosities.
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2020.227966